Support IBMi tables spread over several libraries but under a single journal

## Feature request or enhancement

**Which use case/requirement will be addressed by the proposed feature?**

Currently, ibmi connector only supports tables under a single journal and under a single library.
However the property debezium.include.table.list uses fully qualified name with the library as a prefix.

Adding tables under multiple libraries is therefore possible. The only requirement is that they are registered
to the same unique journal.

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**Implementation ideas (optional)**

a PR will follow shortly but most changes need to be made in JournalInfoRetrieval.getJournal()